Condensation products and vat dyestuffs of the benzanthrone series



Patented Aug. 11, 1931 UNITED STATES ARTHUR LUETTRINGHAUS, or MANNHEIM, HEINRICH NER-ESHEIMER, or L DWIGs PATENT OFFICE HAFEN-ONf-THE-RHINE, AND WILLY EICHI-IOLZ, OF MANNHEIM, GERMANY, IAS- SIGNORS TO GENERAL ANILINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION or DELAWARE COND'ENSATION PRODUCTS AND VAT DYESTUFFS OF THE DENZANTHRONE SERIES No Drawing. Application filed December s, 1928, SerialNo. 323,562, and in Germany December s, 1927. I 1

which are combined in the Bzl-position, by v a sulfur atom, with a radicle of the general formula RCOCH In the latter R is a hydrocarbon radicle which may also contain substituents. Accordingly, the initial materials correspondto the general formula S CHzCOR in which It stands for a hydrocarbon radicle also to be substituted, if desired. The resulting compounds probably correspond to the following formula s-- on-ooR 7 The condensation products are insoluble in dilute acids and are converted by the action furnish remarkably intensely colored solutions with, for example, water, alcohol, acetone, and the like.

The formation of these condensation products, generally speaking, takes place very readily. In some cases a mere treatment of the initial materials with dilute aqueous alkalies is suificient, but, usually,the reaction proceeds more smoothly, when carried out in:

an organicsolvent or suspension medium,- such as alcohol or pyridine.

The said condensation products are converted into valuable vat dyestuffs by treating them with hydrolyzing agents having acid or alkaline reaction and, subsequently, oxidizing the products so obtained. The hydrolysis and the oxidation may also be carried out in one operation. v I The following examples will further illustrate the nature of the invention,f butfthe invention is not limited to these examples.

The parts are by weight.

Example 1 10 parts of acetonyl-Bzl-benzanthronylsulfide, having the formula': i

prepared, for example, by the action of monochloracetone on sodium Bzl-benzanthronyl mercaptlde, are warmed and stlrred at a temperature of from to 40 C. for

6 hours with 5 parts of powdered caustic potash and 50 parts of pyridine. The con of alkalies into salt-like compounds which densation may also be carried out at roorn temperature. The initially red brown color of the fluid mass gradually changes to violet and then to blue. The reaction mixture which gradually acquires the consistency of a pulp is dissolved in water. A violetsolution is obtained which is acidified with hydrochloric acid. The resulting precipitate can be freed from any Bzl benzanthronylmercaptane, which may be formed, for example, by ex traction with an aqueous solution of sodium sulfide, in which the sodium salt of the new compound is sparingly soluble, and itcan be completely purified by crystallization from nitrobenzene.

The resulting substance, which forms orange brown needles, dissolves with difiiculty in the usual organic solvents. lVith concentrated sulfuric acid it furnishes blue green solutions, and with aqueous or alcoholic solutions of an alkali metal hydroxide or even of alkali metal carbonates, very strongly colored violet solutions with intensive scarlet fluorescence.

E mample 2 103 parts of acetonyl-Bzl-benzanthronyl sulfide, are heated and stirred at a temperature 0t from; 55 to 60 C. for 8 hours in l5O parts of a: 33 per cent alcoholic caustic potash solution, The reaction mixture is diluted with water and neutralized with hydrochloric acid, the crude product obtained is treated as in Example 1.

Emam/ple 3,

E mample A mixture of 10 parts of phenacyl-Bzl-benzanthronyl sulfide having the formula prepared, for example, from omega-bromacetophel lone and sod1umBzl-benzathronyl mercaptide, and 5 parts of caustic potash is introduced into 100 parts of pyridine and heated to a temperature of from 55 to 60 C. for 7 hours. The solution is diluted with water, and the new compound is precipitated by means of hydrochloric acid and purified by way of its sodium salt which, differing from that of the Bzl-benzanthronylmercaptane usually present, is soluble with difficulty in water. The new orange brown ketone is sparingly soluble in most organic solvents. It dissolves to a green solution in concentrated sulfuric acid and gives a remarkably strongly blue solution of a cornfiower-like shade in warm aqueous alkali solutions, or in solutions of alkali metal carbonates, in which it dissolves with diificulty, or in alcoholic solutions of all' alies in which it is more readily soluble.

E wample 5 1 part of acetonyl-Bzl-benzanthronyl sulfide is treated for several hours at 125 to 130 C. with 10 parts of anhydrous sodium sulfide. Sodium sulfide employed in excess and Bzlbenzanthronylmercaptane, which may have been formed, are extracted from the reaction mass with cold water, and the residue is dissolved in hot water and freed by filtration from any undissolved initial material which may still be present. hen the red violet solution is acidified a pure product is obtained which is identical with those obtainedaccording to Examples 1 and 2.

Example 6 A mixture of 10 parts chlorphenacyl-Bzlbenzanthronyl sulfide having the formula:

peroxide.

centrated sulfuric acid, being insoluble in cold aqueous solutions of caustic alkalies and on heating sparingly soluble therein to a blue solution.

Example 7 1 part of the condensation product obtained from acetonyl-Bzl-benzanthronyl sulfide as described in Example 1 is heated with 10 parts of a 10 per cent aqueous sodium carbonate solution for 10 hours at a temperature of from 150 to 155 C. in an autoclave. The product so obtained is purified by extraction with pyridine; it is a blue black powder which is practically insoluble in the usual organic solvents, and is also insoluble in concentrated sulfuric acid. When this product is stirred with sulfuric acid monohydrate for several hours it dissolves completely. By diluting this solution with water a flocculent blue-green precipitate of a vat dyestuff is obtained probably corresponding to the formula 1 The hydrolysis may be carried out at lower temperatures but then it proceeds considerably more slowly.

E wample 8 1 part of the initial material employed in I Example 7 is heated with 10 parts of concentrated hydrochloric acid in an autoclave at 150 C. for 10 hours. Thepurification of the hydrolized product, and the conversion of the same into a dyestuff may be carried out as described in Example 7. Instead of concentrated hydrochloric acid, 82 per cent phosphoric acid may be employed.

Example .9

By heating 1 part of the initial material employed in Example 7 with a solution of 1 part of sodium peroxide in 10 parts of water at 160 C. in an autoclave for 10 hours, the dyestufi described in Example 7 is obt'ained in one operation. The dyestuff may be purified by extraction with pyridine.

A solution of 1 part of sodium carbonate and 1 part of ammonium persulfate may be employed instead of the solution of sodium Ema mple 10 1 part of the condensation product which can be prepared according to example 4 is heated with 10 parts of 78 per cent sulfuric acid for 4 hours at 140 to 145 C. whereby sulfurous acid is liberated. The solution is cooled, and the dyestuff which separates out is filtered ofi' with suction and purified, for example, by extraction with pyridine. Part in which R stands for an alkyl or aryl group which may be substituted, and in which the 2-position must be unoccupied, with an al kaline condensing agent.

2. A process for the production of condensation products of the benzanthrone series, which comprises treating a derivative of benzanthrone of the general formula:

in which R stands for a alkyl or aryl group which may be substituted, and in which the 2-position must be unoccupied, with an al- N kaline condensing agent in an organic solvent.

8. A process for the production of condensation products of the benzanthrone series, which comprises treating a derivative of benzanthrone of the formula with an alkaline condensing agent in a organlc solvent.

4. A process for the production of vat dyestuffs of the benzanthrone series, which comprises treating a derivative of benzanthrone of the general formula in whichR stands for an alkyl or aryl group which may be substituted, and in which the 2-position must be unoccupied, with an alka line condensing agent and converting the condensation product into a vat dyestuff by hydrolyzation and oxidation.

5. A process for the production of vat dye-- stuffs of the benzanthrone series, which comprises treating a derivative of benzanthrone of the formula with an alkaline condensing agent and converting the condensation product into a vat dyestuff my hydrolyzation and oxidation.

6. A process for the production of vat dyestuffs of the benzanthrone series, which comprises treating a derivative of benzanthrone of the for1nula:-

with an alkaline condensing agent and converting the condensation product into a vat dyestulf by treating it with an aqueous solution of sodium peroxid under pressure.

7. As new articles of manufacture condensation products of the benzanthrone series corresponding to the general formula at? r in which R stands for an alkyl or aryl group which may be substituted, the said products being insoluble in dilute acids and convertihle by the action of alka-lies into salt-like compounds furnishing intensely colored solutions in alcohol, and into vat dyestuffs by hydrolyzation and oxidation.

8. As a new article of manufacture the compound corresponding to the formula oH-oo on, 

